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FIGURE 135 Schematic for a hot-air installation
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tactor Are you able to relate the schematic to the actual device The gas valve is wired by attaching wire T of the terminal strip to one side of the solenoid and running a wire from the limit switch to the other side of the solenoid Figure 136 shows how the wiring diagram comes from the factory It is usually located inside the cover for the cold-air return In most instances it is glued to the cover so that it is handy for the person working on the furnace whenever there is a problem after installation
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FIELD WIRING The installation of a new furnace requires you to follow a factory diagram furnished in a booklet that accompanies the unit The wiring to be done in the field is represented by the dotted lines in Figure 137 All electrical connections should be made in accordance with the National Electrical Code and any local codes or ordinances that might apply WARNING: The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur This may consist of electrical wire or approved conduit when installed in accordance with existing electrical codes
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Low-Voltage Wiring
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Make the field low-voltage connections at the low-voltage terminal strip shown in Figure 137 Set the thermostat heat anticipator at 060 ampere (or whatever is called for by the manufacturer) If additional controls are connected in the thermostat circuit, their amperage draw must be added to this setting Failure to make the setting will result in improper operation of the thermostat
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FIGURE 136
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Complete instruction page packaged with a hot-air furnace
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Heating Circuits
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FIGURE 137
Heating and cooling application wiring diagram (Carrier)
With the addition of an automatic vent damper, the anticipator setting would then be 012 ampere The anticipator resistor is in series with whatever is in the circuit and is to be controlled by the thermostat The more devices that are controlled by the thermostat, the more current will be drawn from the transformer to energize them As the current demand increases, the current through the anticipator is also increased As you remember from previous studies, a series circuit has the same current through each component in the circuit
Thermostat Location
The room thermostat should be located where it will be in the natural circulating path of room air Avoid locations where the thermostat is exposed to cold-air infiltration, drafts from windows, doors or other openings leading to the outside, air currents from warm- or cold-air registers, or to exposure where the natural circulation of the air is cut off, such as behind doors and above or below mantels or shelves Also keep the thermostat out of direct sunlight The thermostat should not be exposed to heat from nearby fireplaces, radios, televisions, lamps, or rays from the sun Nor should the thermostat be mounted on a wall containing pipes or warm-air ducts or a flue or vent that could affect its operation and prevent it from properly controlling the room temperature Any hole in the plaster or panel through which the wires pass from the thermostat should be adequately sealed with suitable material to prevent drafts from affecting the thermostat
Printed Circuit-Board Control Center
Newer hot-air furnaces feature a printed circuit control The board shown in Figure 138 is such that it is easy for the technician installing the furnace to hook it up properly the first time The markings are designed to make it easy to connect the furnace for accessories if needed Figures 139 and Figure 1310 show the factory-furnished schematic See if you can trace the schematic and locate the various points on the printed circuit boards
HEAT PUMPS The heat pump is a heat multiplier It takes warm air and makes it hot air This is done by compressing the air and increasing its temperature Heat pumps have received more attention since the fuel embargo of 1974 Energy conservation has become a more important concern for everyone If a device can be made to take heat from the air and heat a home or commercial building, it is very useful to many people
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